Grinding wheel dresser



July 15, 1947. A, A LA PQlNTE 2,423,943

GR'INDING WHEEL DREssER Filed July 1'7, 1945 2 sheets-sheet 1 July l5, 1947- A. A. LAl POINTE 2,423,943

GRNDING WHEEL DRESSER Filed July 17, 1943 2 Sheets-Sheet 2 Figure 2 is shown in Fig; 2.

Patented July 15, 1947 e y fg.;-

GRINDINGWHEELnRnssER 5 Alben4 A; Le PenfeQWest Hartford. o'onntrasd signor to yLa'lonte- Engineering Company, 1 `UnionvilleyConn., a corporation `ofConnerytient Application July 17, I943QSeriaLo. 4:9514'J'lj-Y 7 Claims. (CL 11;)

. l My l,invention relates to l grinding wheels such as used forgrindingartielesof various sorts to uniform shapesr,`.andv an object of my inVention,-among others, is the pro.-

vision of a devicefor thispurpose with which grinding wheels may be rapidly dressed `with a maximum degree of precision.

` .'.One form of a machiner embodyingfmy invention andin the construction and use of which .the objects herein set out, as well as others! may be attained is illustrated in -the accompanying drawings, in which-,-v I t 4Figure 1 isa top plan view of the frame f. of al grinding machine showing my improved forming attachment applied thereto and illustrating the manner of Vuse of .the former attach,-

ment. p

a View in vhorizontal section through a portion of the machine and throughy improved attachment applied thereto.A

Figure 3 is a side vieW of the `Figure 4 is a view in sectionv on a p1ane de noted by the dotted line 4-4 of Fig. 3. f

Figure 5 is a` view in section on a plane denoted by the dotted line 5-5 of Fig. 3.

Figure 6 is a view in section on aplane vdenoted by the dotted linevEf-E of Fig. 2.

. Figure 7 is an isometric view on enlarged scale illustrating my improved attachment. E Figure 8 is a similar view illustrating the carrier for the dressing tool with the dressing tool .mounted therein. .Figure 9 is a similar view of the shell-'within which a portion of the mechanism is located `and ythe closure for one end of the shell.

` Figure 10 is an isometricview ofthe spindle for operating the dressing tool carrier.

Figure 11 is an isometric View of the anchoring plate for the spindle.

In the accompanying drawings the numeral y5 denotes the bed piece of the frame of agrinding'machine which is commonly supportedwupon legs and which comprises sides 6 extending along opposite edges of thebed piece and provided with ribs 'l for .the movable support of a head stock 8 and a tail stock 9Y whichA are adjustably secured in place in vany approved andl desired manner, the details of which are omitted from a showing herein as they will be readily understood by those skilled in the art.

Inl the adaptation of my attachment as de.- scribed herein the tail stock 9 is made use of byrme for the support of my improved attach.- ment,v theimmediate support comprising a feed structure as devices for dressing spindle [,II) rotatablyv y'rn'ounted n Y:in the tail stock but held against. 1engthwise V.movement therein.

.Qfscrews l whichy mayl beinV the,w formL of' a clamping arrangement whiclspindle is; `held against vlengthwise movement in the tail. 4stock as yby means or an collar .Iton -the's'pindle' located in @assess in theiheck 0f the teil Stoel" Said recess being closedby a Aclosing plate I3 secured togthef'loack oftheftail stock as by means of wheel type Vis"s"ecu"red 4to the spindle as a means for Voperating it.,

.dressing tool supportIIiis'fsecured to ,and

estende ,from the inner side .er the l tail steek 'as v-slzrcnw'n inv Fig.' .2,Ltlns support being off generally cylindrical forinfandhaving a carrier guide opening I1;y extending from tneendgef the support adjacent.to...thediront` side ofthe tail stocke for 'sone-` distancer toward `the Voitrposite fend' .of

.said support. A carrier guide groove I8 extends falongoneside of said toolsupportl from end to end fand.,v terminatesV iat one end "at the guide opening Il as shownin Figs. 2.a,1`1d 7. 'of the drawin'gsl. Y:Ap.d`1"e'ssing",tool ,guide slot I9 preferably somewhat .narrower than the carrier guide. opening' l Il "ec'tendsJ Ifrom "the 'bottom of the groove jI .'8`lin 'wardly l. into a holek Zzopening into the toolfsupport I6' from theY lendth'e'reoiifln the .preferred structurev and l as'I shown herein it AWill netedthat the'drejssing tool guide slet Is extends .inWardly from .the oarrier'guide. opening .i A dressing 001, earner 2| in the fenn ef bar is'. fittedl foilsliding 'movementinthe carrier guide groove I3,` 'acarrier 'guide 2.2A extending from one .eid'fofrth 'Carrier bar 2| into the carrier guide o'rm'eznirig I'I' `for movemeritthereim this guide havin'gafeed screw opening `23 to. receive the feed 'earrienfasjshown in Figi 'Irene'endof this Steel terminating in thehole' 20. Y. A barrel A25 ris flltd'iipon .andslirl'linds the tOl snppertqls; tnisbar're1 enclosingtnedressing,tool

carrier'ZI andbeing secure'dthereto asby means of` screws. 26.. `Thisloarrel has a slidingmovement 'rupionthe support I5 .one end of its'path fof f movementjterminatirig adjacent thefront ,endl of' one end of the barrel and a screw plug 28 is fitted to close a hole in the center of the screw cap.

The dressing tool 24 includes in its structure a diamond cutter terminating one end, this being of a construction common to grinding machines and which is employed for dressing a grinding wheel 29 which is rotatably supported Vupon the frame of the grinding machine Vin any well known manner and for whichreason details of this support are omitted herein. A spring 30 is attachedVY at 011e end to the barrel 25 and is engaged at its I6 and is secured in said support by av sorew'32` 4 support for the element dressing means. The tail stock 9 is axially alined with the axis of the headstock 8, and is bodily shiftable rectilineariy, together with the dressing means carried thereby, in the direction of length of such alined axes, thus making it possible to shift the tail stock toward and from the head stock at will.

'fin' otherewords, the tail stock, in the present invention is made active only during the dressing .of the shaping element face, while the head stock is active during the shaping of the work; during .the latter period, the tail stock is maintained in access to which may be had through a hole'closed i by a screw 33 when the barrel 25 is moved .to

position to locate said hole opposite the screw 32.

, The abrading surface of the grinding wheel 29 is dressed to conform to the shape of the articles 35 to be4 produced by the operation of the machine, the pattern 3| being secured in the hole 2|)v ofthe dressing tool-support I6 as shown in Fig.

2 and theoppositeendsof the dressing tool 24 being in working engagement with the grinding wheel 29 and the pattern 3|. With the parts in these positions the barrel 24 together. with the parts carried thereby is given 'a reciprocating movement byoperation of the hand wheel I5 and,

thedressing tool 24 moving in contact with the pattern ,3| andj with .the grinding wheel 29the latter has imparted toit a form corresponding to that 'of the pattern 3 I.

The grinding wheel having been properly shaped thej tail lstock may be moved back out of the' way and the Yarticles 35 being successively secured. in the' chuck 34, and the latter being rotated," the grinding wheel is moved into contact with the" articles by means common to grinding machines, and as will be readily understood, and the corresponding forms to that of the grinding wheelare imparted to the articles in a particularlyrapid manner and of a shape approaching perfection toa maximum extent.

Itwill be noted that the grinding wheel has been shownin Fig. 1 in its position for being dressed and*` also in position for shaping the articies;it being understood that such grinding wheel does' notrof courseloccupy these positions at the same time. Aswill be understood, the grinding Wheel '2,9'may be consideredas a rotative shaping element with its peripheral surface constituting a shaping face; as usual with machines of this typethe 'element'29 is so mounted as to be shiftabief in the directionv of its own Aaxis as well as ,directions normal tosuch axisthe two positions of the 4element in Figure 1 illustratesV these shifting movements. Similarly, the headstock 8 isY or the usual structure arranged with a rotative 'chuck` 34. designed .to carry the work 35, the chuck headstock, the tail stock 9 being employed as a an inactive position, as by shifting element 29 or j shifting the tail'stock thus retaining the dressing l5` means intact, and assuring thatl upon restoration to active position for re-dressing of ithe element `the Vshaping face of the latter will be exactly as before, thereby insuring similarity exactness of 'shaped work regardless of the number of pieces which may have been treated and the number of redressings required to compensate for wear in the shaping element.

The means used `for preparing the face of the shaping element for its service is carried by the tail stock and made. up of .the various parts above described, and which may be grouped intoseveral assemblies such', forinstance, as the following: For instance, the support I6 and carrier or member 2| together with the spindle ID and hand-wheel I5, may be considered as an instrumentality having its axis'alined with the head stock axis and designed to support the dressing tool 24 and the pattern 3| in such manner as topermit movement of member 2| rectilinearly relative to support I6 in the direction of length of such axis; since support I6 is anchored against movement relative tothe tail stock and carries the pattern 3|., vwhile spindle isalso mounted in the tail stock in a manner to prevent movement of the spindle rectilinearly relativeto the tail stock but 'free to rotate therein, it is apparent that the pattern 3l will be held in fixed position within the support, being movable only with the tail stock during the position-adjusting movements of the latter.- The member 2|, carried in the grooves of the support is held against rotation, but isV capable of the rectilinear` movement relative to the support through the action of the threaded Zone of spindle I0, and since the member 2| carries the dressing tool 24, the inner end of the tool will traverse the pattern in the direction of length ofthe axis of-the pattern under the manual rotation of wheel|5 and through the threadedl connection between the' spindle and member, the threaded connection and manual rotation of they spindle permitting a controlled movement oithe dressing tool at a'slow rate in such rectilinear direction.

The instrumentality is completed by the barrel or sleeve 25 which overlies and is secured to member 2|-it also overlies the support IG -for a portion of the length of the latter, the sleeve partaking of the movements oimember 2| and is therefore movable rectilinearly of the support. The, outer end of the sleeve is closed by cap 2. The dressing tool 24 extends radially through and beyond the sleeve, the latter carrying, cxternally, the spring '30 which serves to not 'only applyinvvard pressure on the dressing tool but also prevents the latter from rotating as shown in FigureY 9, thus preserving contact Vbetween the tool and pattern. j

.The instrumentality presents a number of ad Vantages'. .For instance, when the pattern has been positioned in hole 29, and secured in pothe member and permit the latter freedom for the lengthl of its rectilinear movement.

6. Means asin claim 1 characterized in that themember is generally of L-shaped conguration, with the longer arm carrying the dressing tool, the shorter arm having. a length approximately equalling the length of the diameter of the support, and with the latter arm operatively connected with the manual operating means, the support being grooved and channeled to receive the member and permit the latter freedom for the length of its rectilinear movement, the free end of the sleeve carrying a removable end closure, whereby the pattern-receiving zone of the support is completely enclosed regardless of the position of the member in its rectilinear Path.

7. Means as in claim lcharacterized in that the manual operating means includes a rotatable spindle supported by and extending through the tail stock, with the spindle carrying a threaded zone axially alined With the tail stockaxis and co-operative with a complemental thread zone of the member, and a hand-wheel carried by the non-threaded end of the spindle.

' l ALBERT A. LA POINTE.

REFERENCES CITED vThe Vfollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,187,690 Martin Jan. 16, 1940 2,294,493 Wilson Sept. 1, 1942 2,076,682 'striclnand Apr. 13, 1937 2,137,690 Kropf Nov. 22, 1938 2,305,115 Sneed Dec. 15, 1942 2,351,269 Kropf et al June 13, 1944 FOREIGN PATENTS Number Country Date Great Britain May 14, 1926 

